Before the Fall

The Fall of Adam & Eve was preceded by another Fall. The serpent was a fallen creature used by Satan. Also, the tree of the knowledge of good and evil was a fallen plant. Satan himself was a fallen angel. So the angels, the plants and the animals fell before Adam & Eve. This is probably why God had to create the garden of Eden – the rest of the world was already corrupted. Of course, this analysis could be wrong. The restitution is larger than just mankind:

“For the anxious longing of the creation waits eagerly for the revealing of the sons of God. For the creation was subjected to futility, not willingly, but because of Him who subjected it, in hope that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.” Romans 8:19-22